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Best to have codes read if the engine light is on. start up and rough idle are different. Rough idle can be different things. When is the last time you had a tune up?
www.2carpros.com/.../oldsmobile-alero-1999-oldsmobile-alero-stumble-... Sep 28, 2008 - Engine Performance problem 1999 Oldsmobile Alero 6 cyl Front ... Hey All, Had a very rough running Mazda 626 on LPG, engine code FP.
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Jul 4, 2010 - Uploaded by GrindTimeAuto
1999 Oldsmobile Alero High Idle Fix ... How To Fix Or Prevent Stalling, Surging Or Rough Idle, Cleaning Throttle Body and MAF Sensor ...
Idling is too slow at 500 rpm.......think about at least 650 rpm to charge the battery and keep up inertia for better take-off power.
Find out how to increase rpm,whether it's a screw-stop adjustment or a timing problem. don-ohio (:^)
You would need to figure out if you are dealing with a fuel problem or an ignition problem to proceed. Have you checked for vac leaks and know for a fact the engine has compression on all 4 cylinders ?
Some causes about rought idle could be: - Valve adjustment - Incorrect ignition timing, - Vacuum leaks - Bad ignition wires (Test w/ ohmmeter) - Incorrect idle speed - Cold Start Injector always "ON" (Revised injector time switch avail.)
A source of rough idle in EFI engines is air leaks or vacum leaks these leaks will upset the fuel mixture without triggering any codes. A bad oxigen sensor will also cause a rough idle, but you should see a code for it ( I think is number 5, but check it).
A good place to start would be an inspection of the spark plugs, plug wires, ignition timing, and idle speed. Next would be valve adjustment. Don't overlook the simple things.
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